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Method for Improving Properties of Heat Treatable Aluminum Alloy Friction Stir Welded Joints

A technology of friction stirring and welding joints, applied in the direction of welding/welding/cutting items, welding equipment, non-electric welding equipment, etc., to achieve the effect of inhibiting dissolution and coarsening

Active Publication Date: 2022-06-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of dissolution and coarsening of precipitated phases and coarsening of recrystallized grains at heat-treatable aluminum alloy friction stir welding joints, the present invention proposes a method for improving the performance of heat-treatable aluminum alloy friction stir welding joints

Method used

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  • Method for Improving Properties of Heat Treatable Aluminum Alloy Friction Stir Welded Joints
  • Method for Improving Properties of Heat Treatable Aluminum Alloy Friction Stir Welded Joints
  • Method for Improving Properties of Heat Treatable Aluminum Alloy Friction Stir Welded Joints

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In the first step, a 4mm thick spray-formed 7055 aluminum alloy sheet is selected, the solution heat treatment temperature is 490±5℃, the holding time is 1h, and it is quickly transferred to the quenching device. The quenching medium is 50±5℃ warm water, and the aluminum alloy is in supersaturation. state;

[0023] The solid solution aluminum alloy is transferred to a low temperature storage device for storage, and the temperature of the device is always controlled below zero;

[0024] Take the aluminum alloy plate out of the storage device, and place it on a friction stir welding machine for welding after reaching room temperature, where the rotation speed of the stirring head is 100r / min, and the welding speed is 100mm / min;

[0025] During the welding process, spray liquid nitrogen on the rear side of the shaft shoulder to cool the joint;

[0026] After the welding of 7055 aluminum alloy is completed, the welded parts are put into the aging heat treatment furnace for...

Embodiment 2

[0031] The first step is to select a 3mm thick 6061 aluminum alloy plate, the solution heat treatment temperature is 530±5℃, the holding time is 1h, and it is quickly transferred to the quenching device. The quenching medium is 50±5℃ warm water, and the aluminum alloy is in a supersaturated state;

[0032] The solid solution aluminum alloy is transferred to a low temperature storage device for storage, and the temperature of the device is always controlled below zero;

[0033] The aluminum alloy plate is taken out from the storage device and placed on a friction stir welding machine for welding, wherein the rotation speed of the stirring head is 1200r / min, and the welding speed is 200mm / min;

[0034] During the welding process, spray liquid nitrogen on the rear side of the shaft shoulder to cool the joint;

[0035] After the welding of 6061 aluminum alloy is completed, the welded parts are put into the aging heat treatment furnace for aging treatment, and the aging temperature...

Embodiment 3

[0040] The first step is to select a 4.5mm thick 2024 aluminum alloy plate, the solution heat treatment temperature is 490±5℃, the holding time is 1h, and it is quickly transferred to the quenching device. The quenching medium is 50±5℃ warm water, and the aluminum alloy is in a supersaturated state. ;

[0041] The solid solution aluminum alloy is transferred to a low temperature storage device for storage, and the temperature of the device is always controlled below zero;

[0042] The aluminum alloy plate is taken out from the storage device and placed on the friction stir welding machine for welding, wherein the rotation speed of the stirring head is 1600r / min, and the welding speed is 120mm / min;

[0043] During the welding process, spray liquid nitrogen on the rear side of the shaft shoulder to cool the joint;

[0044] After the welding of 2024 aluminum alloy is completed, the welded parts are put into the aging heat treatment furnace for aging treatment, and the aging temp...

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Abstract

The invention discloses a method for improving the performance of heat-treatable aluminum alloy friction stir welding joints. The key points include the following process steps: first, the aluminum alloy material to be welded is subjected to solution heat treatment, the solution temperature is (465-545) ± 5°C, the holding time is (4-8) h, after water quenching, it is stored in a low-temperature environment ;Using friction stir welding equipment to weld aluminum alloy, and adopting rapid cooling treatment at the weld position, while suppressing the growth of recrystallized grains, ensure that as many alloy elements as possible are solid-dissolved in the aluminum matrix to obtain a supersaturated solid solution; After the friction stir welding is completed, the entire weldment is subjected to peak aging heat treatment, wherein the aging treatment temperature is (150-190) ± 5°C, and the holding time is (7-20) h. The invention can avoid the dissolution and growth of aging precipitated phases in the welded joints, inhibit the softening of the welded joints, improve the strength and plasticity of the welded joints, and finally obtain a compact structure, a strength reaching more than 85% of the strength of the base metal, and good comprehensive performance. Weld joints.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and relates to a method for improving the performance of a heat-treatable reinforced aluminum alloy friction stir welding joint. Background technique [0002] With the development of lightweight technology, high-strength aluminum alloys are more and more widely used in automobiles and aerospace equipment, and the connection of aluminum alloys also faces more challenges. The friction stir welding process belongs to the solid phase joining technology. The heat input during the welding process is small and the welding temperature is low, which can avoid the defects such as coarse precipitates, hole defects, embrittlement and cracking caused by fusion welding. Friction stir welding is a severe plastic deformation process, and the material will undergo dynamic recrystallization at the welded joint. [0003] 2000 series, 6000 series and 7000 series aluminum alloys are heat-treatable stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/12B23K31/02B23K20/12B23K20/233B23K20/24C22F1/04B23K103/10
CPCB23K31/12B23K31/02B23K20/1235B23K20/1275B23K20/2336B23K20/24C22F1/04C22F1/002B23K2103/10
Inventor 武晓燕江海涛米振莉吴彦欣刘建华
Owner UNIV OF SCI & TECH BEIJING